ASTM D6584 for Free and Total Glycerin in B-100 Biodiesel Methyl Esters
ASTM D6584 Test Method for Determination of Free and Total Glycerin in B-100 Biodiesel Methyl Esters By Gas Chromatography
1. Scope
1.1 This test method provides for the quantitative determination of free and total glycerin in B-100 methyl esters by gas chromatography. The range of detection for free glycerin is 0.005 to 0.05 mass %, and total glycerin from 0.05 to 0.5 mass %. This procedure is not applicable to vegetable oil methyl esters obtained from lauric oils, such as coconut oil and palmkernel oil.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D4307 Practice for Preparation of Liquid Blends for Use as Analytical Standards
E 355 Practice for Gas Chromatography Terms and Relationships
E 594 Practice for Testing Flame Ionization Detectors Used in Gas or Supercritical Fluid Chromatography
3. Terminology
3.1 Definitions:
3.1.1 biodiesel (B-100), n - fuel comprised of mono-alkyl esters of long chain fatty acids derived from vegetable oils or animal fats.
3.1.2 bonded glycerin, n - is the glycerin portion of the mono-, di-, and triglyceride molecules.
3.1.3 total glycerin, n - is the sum of free and bonded glycerin.
3.2 This test method makes reference to many common gas chromatographic procedures, terms, and relationships. Detailed definitions can be found in Practices E 355 and E 594.
